AbstractBackgroundA change of loading conditions in the knee causes changes in the subchondral bone and may be a cause of osteoarthritis (OA). However, quantification of trabecular architecture in vivo is difficult due to the limiting spatial resolution of the imaging equipment; one approach is the use of texture parameters. In previous studies, we...

We propose an adaptive estimation procedure of the hazard rate of a random variable XX in the multiplicative censoring model, Y=XU, with U∼U([0,1]) independent of X. The variable X is not directly observed: an estimator is built from a sample {Y1,...,Yn} of copies of Y. It is obtained by minimisation of a contrast function over a class of general n...

We present the first experimental demonstration over a 43-km-long urban fiber network of a local two-way optical frequency comparison, which does not require any synchronization of the measurements. It was combined with a regular active-noise compensation on another parallel fiber leading to a very reliable and robust frequency transfer. This hybri...

We present a series of inverse problems of nonparametric statistics which have an easy solution using projection estimators on a Laguerre basis. The models are Yi = XiUi, Zi = Xi +Vi, Wi = (Xi +Vi)Ui, Ti = XiUi +Vi, i = 1,. .. , n where the Xi's and Vi's are nonnegative, the Xi's are i.i.d. with unknown density f , the Vi's are i.i.d. with known de...

This paper presents a general methodology for nonparametric estimation of a function s related to a nonnegative real random variable X, under a constraint of type s(0) = c. Three dierent examples are investigated: the direct observations model (X is observed), the multiplicative noise model (Y = XU is observed, with U following a uniform distributi...

De Pascalis, RiccardoDervaux, JulienIonescu, IoanLaurent Limat

en Jan 26, 2017

A variational approach is proposed for modelling the static finite deformation of two (or more) three-dimensional nonlinear elastic solids which merged in a third medium, define a triple line (TL). The total energy, accounting for elastic, surface and possible gravity potentials is then minimized numerically in order to solve two physical problems ...

Bosco, MichaëlMassarweh, AhmadIatmanen-Harbi, SoriaBouhss, AhmedChantret, IsabelleBusca, PatriciaMoore, Stuart E HChristine Gravier-Pelletier

en Jan 22, 2017

Citronellyl- and solanesyl-based dolichol linked oligosaccharide (DLO) analogs were synthesized and tested along with undecaprenyl compounds for their ability to inhibit the release of [(3)H]OSP from [(3)H]DLO by mammalian liver DLO diphosphatase activity. Solanesyl (C45) and undecaprenyl (C55) compounds were 50-500 fold more potent than their citr...

Hybrid artificial antenna systems, with implementation of nature’s basic concept of self-organization of chromophores, attract a vast interest due to their potential application to solar cells. Herein, we report a new supramolecular system comprising of two porphyrins, a free base and its Zinc analogue, bearing diphenylalanine units. The first is g...